Raid Data Recovery
The reason why harddiskdokter.nl is a good choice in raid data recovery is because there is a whole team of raid recovery and server recovery specialists available. This team of experts has access to knowledge of generally accepted research results, which makes us professionals. The raid data recovery team has knowledge of terrabyte servers that are used, for example, in large financial institutions.
That is why we can offer you the following: NO CURE NO PAY! No costs for you if it appears that your raid array server can not be restored. A fixed amount regardless of the time needed to recover the data. We work until the data recovery is successful. If there is physical damage to the hard disk, it is restored in a highly controlled room (only clean room class 1000, class 100 and class 10 are used). The time required for a standard recovery is 4 to 14 working days. Express recovery is also possible and 2 takes up to 5 working days. The exact time depends on the state in which the system is located. The hard disk doctor is familiar with the following data recovery; Damaged or broken raid constructions; damaged striping; raid controller failure; formatted raid drive; software or operating system problems; Failure of read head or motor"> Ticking hard disk; not accessible hard disk; damaged partition; rebuild raid failure; the system does not start due to missing operating system; raid device not ready report; inaccessible boot device; formatted with fdisk; partly mounted drives; NTLDR is missing; failure of 1 or more raid set drives; corrupt parity / data drive; accidental or intentionally deleted partitions; raid controller failure; replace the wrong hard disk or media. RAID (redundant array of independent discs) is a concept in storage technology that provides better protection against not being able to access data and data loss than conventional hard drives. In theory, these systems can function for one hundred to one thousand years without loss of data. Raid has a better performance when reading and writing on the system compared to conventional hard disks. The raid concept was developed in 1987 by a group of students. Their knowledge contributed to 5 raid systems, each qualifying a different level of safety and performance. 3 systems of the original project have proved commercially attractive. Level 1, level 3 and level 5. Level 0 divides the data on 2 hard disks (striping). It promotes the transmission of data with 50 percent. Level 1 uses mirroring. This means that the data on 2 hard disks is described identically, so that a copy of the original is created. The disadvantage is that 2 times the space is needed to store data. Level 3 and level 5 make better use of the capacity of the hard disks than level 1 and combine striping and mirroring on multiple hard disks. There are even more advantages of a raid system. Raid contributes to the data being evenly distributed on the hard disks. It prevents the hard disks from becoming too hot due to insufficient cooling in connection with a maximum performance, which in short means that the lifetime of the hard disks is prolonged.
Description of raid 0
Raid 0 striping of data. Distributes the data over multiple hard disks, which means a higher throughput of data. If two hard disks of 250 Gb are used, the storage capacity is 500 Gb.
Benefits of raid 0
The reason for choosing a raid 0 system is that the high performance of the system is guaranteed by means of stripping. The data is evenly distributed over multiple drives. Data can be accessed faster without causing delays due to a botleneck effect such as on a single drive. This has advantages when large files are copied.
Disadvantages of raid 0
The fault tolerance has a less important role. The chance of losing data is higher. Every error of the hard disks results in loss of data.
Description of raid 1
A raid 1 system has the ability to mirror data. For example, a copy is made simultaneously on another hard disk. In case of a defect or malfunction, there is no loss of data. If 2 is used 250 times, then the storage is only 250 gb.
Benefits of raid 1
This results in a complete copy of data on another hard disk. In the event of a defect in one of the hard disks, the data on the other hard disk will still be present.
Disadvantages of raid 1: A raid 1 system will take the capacity of the smallest hard drive. The access time and speed of the system will be significantly less with a lot of data traffic.
Description of raid 2
A raid 2 system provides protection in the event that a hard disk does not function properly or if a hard disk is defective.
Benefits of raid 2
This raid level makes a fault tolerance based on the Hamming error correction code (ECC), which is used to ensure the integrity of the data. The higher the data transmission, the better the ratio of ecc hard disks. If the code is correct, the data is in order. If an irregularity is detected in the data, the lost data can be recalculated by a checkpoint. This is a quick way of recovering corrupt data. The controller design is simpler than that of raid levels 3,4, & and 5.
Disadvantages of raid 2
Not commercially attractive. And is inefficient with data transmissions. The costs for the purchase of the system are high. This raid construction requires large and fast hard drives.
Description of raid 3
The data blocks are divided over several hard disks. Stripe parity is made when writing on the parity drive and is checked when reading the data. Striped data on byte level over multiple hard disks and the parity is stored on a hard drive. This level is very similar to raid level 4. Byte level striping requires hardware support for efficient use.
Description of raid 4
Stripes data on block level, divided over a number of hard disks with the parity stored on a hard drive. The parity information allows a recovery of damaged data on a hard disk. The performance of a raid level 4 is very good for read operations (same as level 0). Writing operations take longer because parity data has to be updated. This will be delayed for small files. With large files this will be faster. The costs for a raid 4 level are low because only the 1 drive saves the array of data.
Description of raid 5
Raid level 5 is most commonly described as striping with parity. Raid level 5 looks like level 4 but divides the parity over the hard disks. Here no hard disk is used for the parity data. This means that smaller files can also be written faster. Because parity data is written on all hard disks, read operations are slower than for raid level 4.
Description of raid 0 / 1 or 10
Raid 0 / 1 or 10 is a dual level construction. It has the advantages of raid 0 and 1. with a construction of, for example, 4 hard disks, a striped (raid level 2) construction is made on the first 0. A mirror of the 3 and 4 hard disks is then created on drive 1 and 2. This way of storage offers a fast and secure way to store data. Data does not have to be recalculated for errors, because this can be done with a simple copy operation of the mirrored hard disks.
Description of raid 0 / 5 or 50
Raid level 5 is known for striping with parity. Raid level 5 is the same as raid 4 except that raid 5 divides the parity over the drives. The speed when writing small files is higher. Because the parity data has to be read over different hard disks, reading will be slower than with a raid 4 system. The cost is the same as with a raid 4 system.